How often do active-shooter incidents occur?

A. Active shooter incidents are rising exponentially and are expected to exceed 2,000 per year by 2025. B. Active-shooter incidents are on a slight rise. On average, 20 active-shooter incidents per year have occurred in the United States during the past decade C. Thirty active-shooter incidents occurred in 2019, with an expected 30% increase each future year. D. On average, an active-shooter incident occurs once a week in the United States; this number is up from once a month.